Source here. (click on image to enlarge)
This chart represents the 15 years (180 months), starting April 1, 1997 and ending March 31, 2011. Per the latest NOAA/NCDC U.S. temperature data records, the 12-month period ending March 2011 was the 6th coldest March-ending period for the last 15 years. In terms of a single month, March 2011 was 79th coldest March in the past 117 years.
The per century cooling trend of this period, a minus 2.9°F, took place in spite of the huge warmth produced by two large El Niño events during this 15-year span: 1997-1998 and 2009-2010.
For the 10-year period ending March 2011, the cooling trend accelerates to a very significant minus 12.9°F per century rate - again, per the updated NOAA/NCDC temperature records. (click on image to enlarge)
At some point, U.S. continental warming will resume, but the extended decade-long plus global cooling trend persists, contradicting the experts. None of the IPCC climate models, nor "consensus" experts predicted this cooling trend for the continental U.S.
Additional modern temperature charts. Historical temperature charts.